Psalm 145:3 Great is the Lord and most worthy of praise; His greatness no one can fathom.
When we describe someone as being great, we normally mean they are great in a particular manner or way; great with money, great with love, great with hugs, great with remembering things…
When we say God is great it is because He is great in every way! Great in wisdom, power, faithfulness, holiness, grace, goodness, mercy – the list goes on!
When we look at what God has done we begin to see we cannot really grasp just how great He is.
Just accept it and know that He is your God!